US2517581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of dehensionaijly stabilizing
Assignee: —
•
Filing: —
•
Granted: 1950-08-08
•
Expires: 1967-08-08
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:46
CPC Classifications
B; B29; B29C; B29C71/00; B29C71/02; C; C08; C08J; C08J5/00; C08J5/18; Y; Y10; Y10S; Y10S128/00; Y10S128/18; Y10S260/00; Y10S260/23; Y10S8/00; Y10S8/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
THE METHOD WHICH COMPRISES HEATING A FILM OF A CRYSTALLINE COPOLYMER OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE, HAVING PREFERRED ORIENTATION OF THE CRYSTALLITES IN LAYERS PARALLEL TO THE SURFACES OF THE FILM, TO A TEMPERATURE BETWEEN 125* C. AND 10 CENTIGRADE DEGREES BELOW THE SOFTENING POINT FOR A PERIOD BETWEEN 10 SECONDS AND 150 SECONDS WHILE SO SECURING THE FILM AS TO PERMIT AT LEAST 10 PER CENT AND TO PREVENT MORE THAN 70 PER CENT OF THE SHRINKAGE WHICH THE SAME FILM EXHIBITS WHEN HEATED FOR THE SAME TIME AND AT THE SAME TEMPERATURE BUT WITHOUT RESTRAINT, AND COOLING THE FILM AT LEAST TO 100*C. UNDER SUFFICIENT TENSION TO PREVENT FURTHER CHANGE IN DIMENSION, AND RELEASING THE WRINKLE-FREE PRODUCT, WHICH STILL EXHIBITS PLANAR ORIENTATION AND REPRESENTATIVE SAMPLES OF WHICH ARE CHARACTERIZED BY HAVING A RESIDUAL SHRINKAGE OF LESS THAN ABOUT 3 PER CENT WHEN REHEATED IN AN UNRESTRAINED CONDITION TO 100*C. FOR 30 MINUTES.
Claim 2
Independent Claim
155 words
THE METHOD WHICH COMPRISES HEATING A FILM OF A CRYSTALLINE COPOLYMER OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE, HAVING PREFERRED ORIENTATION OF THE CRYSTALLITES IN LAYERS PARALLEL TO THE SURFACES OF THE FILM, TO A TEMPERATURE BETWEEN 125* C. AND 10 CENTIGRADE DEGREES BELOW THE SOFTENING POINT FOR A PERIOD BETWEEN 10 SECONDS AND 150 SECONDS WHILE SO SECURING THE FILM AS TO PERMIT AT LEAST 10 PER CENT AND TO PREVENT MORE THAN 70 PER CENT OF THE SHRINKAGE WHICH THE SAME FILM EXHIBITS WHEN HEATED FOR THE SAME TIME AND AT THE SAME TEMPERATURE BUT WITHOUT RESTRAINT, AND COOLING THE FILM AT LEAST TO 100*C. UNDER SUFFICIENT TENSION TO PREVENT FURTHER CHANGE IN DIMENSION, AND RELEASING THE WRINKLE-FREE PRODUCT, WHICH STILL EXHIBITS PLANAR ORIENTATION AND REPRESENTATIVE SAMPLES OF WHICH ARE CHARACTERIZED BY HAVING A RESIDUAL SHRINKAGE OF LESS THAN ABOUT 3 PER CENT WHEN REHEATED IN AN UNRESTRAINED CONDITION TO 100*C. FOR 30 MINUTES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |